我是英语新手.想了解to这个单词怎么用，又有什么规律，怎么有时候后面加the.有时候又没加。搞不懂哦。。哎

英语怎么写出一个正确的句子，一些介词（at,to,on,for...）应该怎么使用，应该什么情况下？~

你这个问题，问的确实有点大啊~~~
怎么写出一个正确的句子，i have a pen(正确)，I have a nice pen（正确）。。。
如果你是担心自己写的形式错的话，那么我可以推荐一个方法，就是在简单句上增彩。
简单句就是主谓宾，如i have pen。你只要在上面增加你觉得需要的东西。
（ihaveapen我有只笔
that is going to wirte something on my paper让我在纸上写东西
where i can make the magic begin可以创造奇迹
so that i can see whats in my head, visually让我可以看到我脑子里的东西
about anything关于一切）
用上面的方法你可以提升自己的英语水平以及想象力。而且因为是基础，你可以很快建立起金字塔般的知识储备。

at to on for
at对着，向着。you should put it at here你应该把它放在这里，you should aim at him你应该对着他...
to对于，位置标志. this is hard to me这对我来说太难了; you should go here to there.你应该从这里到那里。
on把什么安置好，什么物或人上，施加什么在什么上，状态刚刚好。put it on穿好了！; the pen is on the paper笔在纸上; i have so many pressure on me我压力好大; this is on set一切准备就绪; your dress is on point你衣服搭配恰到好处.
for和to几乎一样。for me/to me，如果只是一般想学好英语，真的没必要深究。for一般表示专门为某人。for people like me为我而言. this is for you这是专门给你的.

To 和 for 的区别：一般情况下, to后面常接对象; for后面表示原因与目的为多。
1、to sb.表示对某人有直接影响比如，食物对某人好或者不好就用to;
2、for表示从意义、价值等间接角度来说，例如对某人而言是重要的，就用for。
3、for和to这两个介词，意义丰富，用法复杂。

扩展资料
for
英语单词简介
for后加动名词
人称加宾格
to
prep.
向，往，给...，于...，直到...为止，在...之前，比，对，[表示程度、范围] 到，达
情态动词后不加to直接加v.（原）
行为动词加to do sth.（如：need)
(表示时间)到, 直到, 在?到来之前, 离?； 例：from seven to ten
(表示方向)朝, 往, 通向
(表示状态)紧贴着, 紧靠着, 对着；
(表示对象)对, 对于, 对?来说；
(表示比较)比, 相对于；
(表示方位)在?方向[方位], 处于?顺序；
(表示距离)离, 距离；
(表示目标)到达, 直到；
(表示结果)转换为, 转变为, 趋于

一：表示相对，针对
be strange (common, new, familiar, peculiar, distinct, sensitive, immune, vulnerable, indispensable) to
Air is indispensable to life.
Aircrafts are vulnerable to interference caused by radiation.
This injection will make you immune to infection.
二：表示对比，比较
1：以-ior结尾的形容词，后接介词to表示比较，如：superior ,inferior,prior,senior,junior
The quarrel happened prior to my arrival.
2: 一些本身就含有比较或比拟意思的形容词，如equal，similar，equivalent，analogous
A is similar to B in many ways.
3：表示一些先后顺序的形容词，如：second,subsequent,next,preliminary,preparatory
Subsequent to the war,they returned to their hometown.
4: to也偶尔出现在个别动词之后,与动词形成固定词组,表示比较,如:prefer to,compare to,in contrast to compare to sth.表示比喻或比拟,而compare with sth.表示比较,如:
World is usually compared to a stage
Compared with his past,he has changed a lot.
Prefer的正确句型是:prefer A to B或prefer doing A to doing B,但当prefer后接动词不定式时,表示比较的介词to就要改成rather than ,如:
The undaunted soldier preferred death to surrender.
Many people prefer spending money to earning money.
They prefer to pursue careers rather than remain home as house wives.
5: to与及个别的名词构成比较之意,如:alternative
Going to an under water concert is a great alternative to going to dinner.
三: 表示修饰关系
1: 表示回复,反应意思的词,如:answer to question,
solution to problem,response to inquiry,reaction to proposal,reply to letter
2: 表示建筑构件的词汇,如: entry,entrance,approach,access,passage,exit,vent,path
the approach to a bridge引桥
the approach to science
Half of the population was estimated to have no access to the health service.
The access to education 接受教育的机会
The access to medical care 享受公费医疗的权利
3: 表示人物职位和官衔的词,如:assistant to manager, ambassador to Spain, successor to tradition, heir to throne,deputy to the National People’s Congress
advisor to the Prime Minister
4: 表示权利和许可的词汇,如:right,admission
The employee finally got the admission to the boardroom.
Everyone has an equal right to ……..
5: 表示栅栏或障碍的词汇,如:bars to development,the barrier to progress
6: 表示与书籍,文本相关的词,如:introduction to passage.
7: 表示恭喜或是祝贺,如:
The director proposed a toast to the health of the guests.
Let’s drink to Dick’s success in business
8: 另外还有一些名词符合这种用法,有的具有两者息息相关,缺一不可的含义.如:key to door,invitation to party,guide to action,limitation to life,accessory to school
四: to还具有依据,伴随,和着节奏的含义,如:sing to piano, chance to the tune, stamp to the rhythm of the song, add salt to taste
（一）：表示相关联，相连接，如：be related to,be relative to,in relation to,be relevant t Investigate all the facts related to the problem.
People often linked walth to happiness.
（二）：表示反对和赞同。
1：to引导的表示反对，抗拒，对抗意义的词组。Be opposed to,be oppsist to,be contrary to,be adverse to,be resistant to,be contradictory to,object to,oppose to,deny tp,be aline to
These buildings are resistant to earthquake.
They are to tally opposed to any changes being made in the plans.
2: to引导的表示同意，赞同意义的词组：consent to,subseribe to,
The employer consented to give him a salary raise.
表示调整，使符合，使适应的含义，如：adapt to,commodate to, adjust to,conform to,habituate to,fit to,suit to,correspond to,cater to
She tried to habituate herself to the style of plain living.
Your action should conform to the interests of the people.
They offered various foods to cater to the need of customers.
His words doesn’t fit to his actions.
Suit your writing style to the masses.
3: 表示投降,屈服,服从的含义,如:be subject to,be subordinate to,submit to,subject to,surrender to,give in to,confess to,admit to.
The minority is subordinate to the majority少数服从多数
Countries nearby oceans are always subject to earthquake.
He confessed to having robbed the woman of her wallet.
We’re not the kind of people to yield to any military threat.
五: 表示趋势或倾向,如:tend to,be prone to,be inclined to,be apt to,be liable to
He’s liable to seasickness.
You are liable to come to wrong conclusion.
六: 表示对事情的坚持与执着,如:sick to,hold o,adhere to,cling to
He still holds on to his original views.
七: 表示约束,局限,如:limit to,confine to,resrict to
He’s confined to the house by illness.
He confined his remarks to scientific mangement.
八: 表示一种习惯或是一种适应性,如:get (be) to,used to,be accustomed to
Finally,the students got used to my teaching method.
九: 表示起因和原由,如:owing to,due to,thanks to,attribute to,come down to
The flight was cancelled due to the thick fog.
The famous artist attributed his success to his wife.
十: 表示目的或结果,如:aim to,lead to,give rise to
I aim to be an excellent college teacher.
His conceit lead to his failure.
These bad condition has given rise to a lot of crises
十一: 表示命运,注定,如:be doomed to,be destined to,
All military adventures by the two super powers are doomed to fail.
十二: 表示数量上的积累或增加,如:in addition to,add to,amount to
In addition to relief supplies,he also presented with some money.
The annual output of steel amounts to 1200 tons.
十三: 表示全身心投入的含义,如:be addicted to,contribute to,devote to,commit to
He is determined to devote all his life to his.
十四: 表示展望或是回顾,如:look forward to反date back to
The church dates back to the 13th century.
十五: 表示方位概念.如:close to,next to
I don’t like wool next to my skin.
十六: 表示依靠或借助,如:resort to,turn to,appeal to,
He usually appeals to arms to settle the territory dispute.
十七: 表示有关注,关于: as to,with regard to
十八: 表示关注或重视,如:pay attention to,attach to,
We should attach primary importance to job training.
十九: 表示依据或是根据,如:according to,in proportion to
According to today’s newspaper,the match will be postponed.
The lending countries subscribe towards capital stock in proportion to heir economic importance.
二十: 表示应该或必须含义的句式, 如:
It’s time to get up.
We are supposed to get here at seven.
It’s up to this country to ban nuclear weapons.
常用词组
respond to（反应）, appeal to（吸引）, catch on to（理解）, listen to （收听）,used to（过去常常）, give birth to,attend to（照料）, see to（负责）, be entitled to（有权）, belong to（属于）, come to（苏醒）, stand up to（勇敢面对）, help oneself to（请自便）, refer to,to the point（切题）,
Train them to stand up to any severe test in hard.
The ticket entitled you to a free meal in the luxury hotel.
See to it that the children get a hot meal after their swim.
You will catch on to the job shortly after wards.
People usually refer to television for up-to-the-minute news.
参考资料：http://www.360doc.com/content/09/0711/11/106745_4222381.shtml

to 本身是一个介词。
如果后面加的是动词原形的do的话，就构成TO do ，也就是平时所说的不定式。to be doing /done 的话则是一个被动的语态 了。
既然它是介词，那么后面当然可以加名词了。比如 go to the party .
你刚刚提到的后面加the . 这就要弄清楚定冠词the 的用法了。
the可以代指前面提到的事物 。
而且很多名词加the 和不加the 是有很大的区别的。
比如说GO TO SCHOOL .意思就是去上学。
而GO TO THE SCHOOL .意思则是去学校，不一定是去上学，也可能是去学校有事。上班啊那些。

英文不能这样学，提出一个词来学。英文要提出一串东西来。这样，把以往学过的只要有to的全都收集出来，然后分析。这叫做归纳法。

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